Answer:
Explanation:
10c - f = -13 + cd =
-dc + 10c - f + 13 = 0
(-d + 10) × c + (-f + 13) = 0
c= - (-f + 13) /(- d+10) -d+10≠0
c = (-f + 13)/(d - 10)
10c-f=-13+cd
10c-cd=-13+f
c(10-d)=-13+f
c=-13+f/10-d
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